a-a a-b aaa aab aah aak aao aar aas aav ab- aba abb abh abk abo abr abs abv aha ahb ahh ahk aho ahr ahs ahv aka akb akh akk ako akr aks akv aoa aob aoh aok aoo aor aos aov ar- ara arb arh ark aro arr ars arv as- asa asb ash ask aso asr ass asv av- ava avb avh avk avo avr avs baa bab bah bak bao bar bas bav bba bbb bbh bbk bbo bbr bbs bha bhb bhh bhk bho bhr bhs bhv bka bkb bkk bko bkr bks bkv boa bob boh bok boo bor bos bov bra brb brh brk bro brr brs brv bsa bsb bsh bsk bso bsr bss bsv bva bvb bvh bvk bvo bvr bvs bvv haa hab hah hak hao har has hav hba hbb hbh hbk hbo hbr hbs hbv hha hhb hhh hhk hho hhr hhs hhv hka hkb hkh hkk hko hkr hks hoa hob hoh hok hoo hor hos hov hr- hra hrb hrh hrk hro hrr hrs hrv hsa hsb hsh hsk hsr hss hsv hv- hva hvb hvk hvo hvr hvs hvv ka- kaa kab kah kak kao kar kas kav kba kbb kbh kbk kbo kbr kbs kha khh khk kho khr khs khv kkb kkh kkk kkr kks kkv koa kob koh kok koo kor kos kra krk kro krr krs krv ksa ksb ksh ksk kso ksr kss ksv kva kvb kvh kvk kvo kvr kvs kvv oaa oab oah oak oao oar oas oav ob- oba obb obh obk obo obr obs obv oha ohh oho ohr ohs oka okb okk oko okr oks oo- ooa oob ooh ook ooo oor oos oov or- ora orb orh ork oro orr ors orv os- osa osb osh osk oso osr oss osv ov- ova ovb ovh ovo ovs ovv ra- raa rab rah rak rao rar ras rav rba rbb rbh rbk rbo rbr rbs rh- rha rhb rhh rho rhr rhs rhv rkb rkk rko rks rkv roa rob roh rok roo ror ros rov rra rrb rrh rrk rrr rrs rsa rsb rsh rsk rso rsr rss rsv rva rvb rvh rvo rvr rvs rvv saa sab sah sak sao sar sas sav sba sbb sbh sbk sbo sbr sbs sbv sh- sha shb shh shk sho shr shs shv sk- ska skb skh skk sko skr sks soa sob soh sok soo sor sos sov sr- sra srb srh srk sro srr srs srv ss- ssa ssb ssh ssk sso ssr sss ssv sva svb svk svo svr svs svv v-a vaa vab vah vak vao var vas vav vba vbh vbk vbo vbr vbs vbv vh- vha vhb vho vhs vka vkb voa vob voh vok voo vor vos vov vra vrb vrh vrk vrr vrs vsa vsb vsh vsk vso vsr vss vsv vva vvb vvo vvr vvs vvv